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Hot off the press is motoring news that Google is to start building "self driving" cars aimed at developing self drive cars for the public.

Google's self driving electric cars will be limited to around 25mph initially for safety.

The cars will only have a stop start button, no other controls including no stearing wheel, no accelerator or brake pedals and will navigate using Google maps.

The electric cars are designed to be pedestrian friendly with flexible windsreen instead of glass and softer front for pedestrian safety.

Google co-founder Sergey Brin told reporters that the firm is to make 100 prototype cars that drive themselves however it is thought unlikely that Google will start mass producing cars for resale and is more likely to work with other car manufacturers to bring self drive electric cars to market safely.

Google's self driving cars navigate their surroundings using a combination of GPS, laser and camera data.

There are hurdles to overcome such as which roads, in which American states, Google will be allowed to test the self drive cars as Google develops it's self drive cars project.

Plus who is liabile in the event of a accident?

Self Drive cars are only likely to be practical in city centres initially where road speeds are lower, pollution, congestion and road safety for pedestrians is a focus of attention.

For motorway driving adaptive cruise control which regulates distance from the car in front is already available in production cars in the UK with Volkswagen being one of the leaders in adaptive cruise control.